Excited State Intramolecular Proton Transfer in O-Tosylaminobenzaldehyde |
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Authors: | Mikhail N Khimich Leonid D Popov Anatoly S Burlov Boris M Uzhinov |
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Institution: | Chemistry Department, Moscow State University, 119991, Moscow, Russia. |
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Abstract: | Excited state intramolecular proton transfer (ESIPT) in o-tosylaminobenzaldehyde has been investigated. According to quantum-chemical calculations ESIPT in o-tosylaminobenzaldehyde is barrierless. Product of ESIPT undergoes efficient nonradiative deactivation caused by internal rotation of C(H)OH-group. The solvent orientational relaxation in anionic form of o-tosylaminobenzaldehyde was detected. The mechanism of anionic form fluorescence quenching at the addition of the base in a protic solvent is proposed. It consists in the intermolecular proton transfer from the protonated base to oxygen atom of aldehyde group followed by the internal rotation of C(H)OH-group. |
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